Circuit-closer.



l. E. BISHOP.

CIRCUIT CLOSER.

APPucmon FILED MAY19, 1914.

1,1 61,594. Patented Nov. 23, 1915.

UNITED sTATEs PATENT oEEioE.

JAMES E. BISHOP, GF FITZGERALD, GEORGIA.

cinourrcnosnit.

Application led `May 19, 1914.

To all whom t may concern.'

Be it known that I, JAMES E. BISHOP, citizen of the United States, residing at Fitzgerald, in the county of Ben Hill and State of Georgia, have invented certain new and useful Improvements in Circuit-Closers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to circuit closers and has for an object to provide a device embodying improved means for automatically closing an electric circuit when the surrounding atmosphere is heated above a predetermined temperature.

A further object of the invention is to provide an electric circuit including any usual and ordinary form of alarm or signal with terminals normally out of contact with means for bringing the terminals into contact when the atmosphere at or adjacent to such terminals is raised above a predetere mined temperature.

Vith these and other objects in view the invention comprises certain novel constructions, combinations and arrangement of parts, as will be hereinafter more fully described and claimed.

In the drawings: Figure 1 is a view of the improved alarm in side elevation with the contacts out of engagement. Fig. 2 is a view in side elevation with the contacts in engagement. Fig. 3 is a fragmentary view of the insulating of one contact upon the other. Fig. 4L is a view in section of the means for retaining the contacts out of engagement.

Like characters of reference designate corresponding parts throughout the several views.

The improved iire alarm which forms the subject matter of this application comprises a spring 10 of substantially U-shape, one end of which is bent upon itself as at 11 and terminating in a binding post 12 or other means for attaching a wire 18 thereto. The Wire 13 extends to any approved alarm shown conventionally as the bell 14 which is in circuit with asource 0f electrical energy 15 with a return wire 16. The return wire is insulated upon the spring 10 by an insulating block 17 but is electrically connected to a spring 18, the end of which is spaced intermediate the return bend of the Specification of Letters Patent.

Patented Nov. 23, 1915. seriaiNo. 839,616.

spring 10 normally out of engagement with both members of the return bend, as shown at Fig. 1 but capable of moving into engagement with one of the sides of such return'bend as at Fig. 2 and closing the circuit.

To close the circuit a rod 19 is inserted through the opening 2O in the spring 10, its opposite end being seated in the bifurcated end 21 of such spring and a collar 22 rigidly secured upon such rod upon which the bifurcated end of the spring bears. Thus associated the spring 10 forces the rod 19 against the spring 18 and forces said spring 18 into engagement with the side of the return bend closing the circuit. It is desirable to hold the rod 19 out of such action and thereby maintain the circuit open except when the atmosphere immediately adjacent such rod rises above a predetermined temperature. To accomplish this a sleeve 23 is mounted upon the rod 19, such sleeve being provided with an opening 24 through which a fusible material 25 is poured surrounding the rod 19 and maintaining the sleeve in position upon the rod as indicated at Fig. 1. This fusible material may be of any of the usual material employed for the purpose and the melting point predetermined as occasion may require.

With the sleeve and rod maintained in the position shown at Fig. 1 by the fusible material it is obvious that the circuit will remain open and the signal inoperative. Vhen, however, by reason of heat the fusible material 25 has become sufficiently softened the spring 10 will force the rod 19 through the sleeve 23 and force the spring 1S into engagement with the return bend of the spring 10 thereby closing the circuit as indicated at Fig. 2 and energizing the alarm.

I claim:

1. In a device of the class described, a substantially U-shaped spring having one end bent backwardly upon itself to produce spaced members; a spring secured to the first mentioned spring by insulating material and having an extremity extending between the spaced members; a rod extending across the extremity of the U; a sleeve surrounding the rod; a fusible material connecting the sleeveand rod and holding the rod out of engagement with the second mentioned spring.

2. In a device of the class described, a

g y 1,161,594I

spring of substantially U-shape having one sleeve and holding the rod normally out of l0 of its ends extended and bent baokvvardly. engagement with the spring Contact.

upon itself producing an interval between ln testimony whereof I aiix my signature the members; e spring Contact secured to in presence of tWo Witnesses. the irst mentioned spring?,` by insulation and JAMES E BISHOP extending into the interval; :t rod extending across the U and directed toward the spring Witnesses:

Contact; si sleeve surrounding the rod; a JAS. T. THOMPSON, fusible material Connecting the rod and ELDERIDGE CUTTs.

lopies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents. Washington, D. C. 

